Installing the ITB's won't be the biggest problem you have, it's managing/metering the airflow and fuel management. Not worth it when you can find motorcycle ITB's and get an adapter plate custom made.
motorbike TBs are a load of work to fit, not jsut fitting a sandwich plate, and are also smaller than the dbilas TBs and the dbilas setup is tried and tested in terms of port tuning etc.
Thus generally speaking the dbilas kit will look better and give better performance than motorbike bodies..
The Dbilas setup can also run off the AFM and use the standard TPS/fuel system, although obviously this will not give optimum power output. Sorting something like MS wouldn't be the end of the world.
you get what you pay for. The dbilas kit is expensive, yes, but also probably fairly priced on balance.
I think my ITBs are probably less compromised than the dbilas setup, but i never set out to build a kit that could work with the factory AFM and airbox.